package com.dushibao.manage.article;

import com.alibaba.fastjson2.JSONObject;
import com.dushibao.utils.AppUtils;
import lombok.SneakyThrows;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.*;
/**
 * KindEditor JSP
 *
 * 本JSP程序是演示程序，建议不要直接在实际项目中使用。
 * 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。
 *
 */
@WebServlet("/article/UploadJson")
public class UploadJsonServlet extends HttpServlet {
    private String getError(String message) {
        JSONObject obj = new JSONObject();
        obj.put("error", 1);
        obj.put("message", message);
        return obj.toJSONString();
    }

    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)  {
        //文件保存目录路径
        String savePath = AppUtils.getValue("upload") + "/attached/";

        //文件保存目录URL
        String saveUrl  = AppUtils.getValue("cdnServer") + "attached/";

        //定义允许上传的文件扩展名
        HashMap<String, String> extMap = new HashMap<String, String>();
        extMap.put("image", "gif,jpg,jpeg,png,bmp");
        extMap.put("flash", "swf,flv");
        extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
        extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

        //最大文件大小
        long maxSize = 1000000;

        resp.setContentType("text/html; charset=UTF-8");

        if(!ServletFileUpload.isMultipartContent(req)){
            resp.getWriter().write(getError("请选择文件。"));
            return;
        }

        //检查目录
        File uploadDir = new File(savePath);
        if(!uploadDir.isDirectory()){
            resp.getWriter().write(getError("上传目录不存在。"));
            return;
        }

        //检查目录写权限
        if(!uploadDir.canWrite()){
            resp.getWriter().write(getError("上传目录没有写权限。"));
            return;
        }

        String dirName = req.getParameter("dir");
        if (dirName == null) {
            dirName = "image";
        }
        if(!extMap.containsKey(dirName)){
            resp.getWriter().write(getError("目录名不正确。"));
            return;
        }

        //创建文件夹
        savePath += dirName + "/";
        saveUrl += dirName + "/";
        File saveDirFile = new File(savePath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String ymd = sdf.format(new Date());
        savePath += ymd + "/";
        saveUrl += ymd + "/";
        File dirFile = new File(savePath);
        if (!dirFile.exists()) {
            dirFile.mkdirs();
        }

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("UTF-8");
        List items = upload.parseRequest(req);
        Iterator itr = items.iterator();
        while (itr.hasNext()) {
            FileItem item = (FileItem) itr.next();
            String fileName = item.getName();
            long fileSize = item.getSize();
            if (!item.isFormField()) {
                //检查文件大小
                if(item.getSize() > maxSize){
                    resp.getWriter().write(getError("上传文件大小超过限制。"));
                    return;
                }
                //检查扩展名
                String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                if(!Arrays.<String>asList(extMap.get(dirName).split(",")).contains(fileExt)){
                    resp.getWriter().write(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));
                    return;
                }

                SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
                String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
                try{
                    File uploadedFile = new File(savePath, newFileName);
                    item.write(uploadedFile);
                }catch(Exception e){
                    resp.getWriter().write(getError("上传文件失败。"));
                    return;
                }

                JSONObject obj = new JSONObject();
                obj.put("error", 0);
                obj.put("url", saveUrl + newFileName);
                resp.getWriter().write(obj.toJSONString());
            }
        }
    }
}
